Nightfallen rep transferable?

so this is probably a stupid question but is the Nightfallen rep possible to transfer across all characters or just one? it's just I avoid Suramar like the plague on my alt's for two reasons: 1 is "an illusion, what are you hiding?" and 2 is the !@#$ing rep grind to exalted to do something as simple as finish the last few quests in Suramar(seriously Blizzard, whose idiotic idea was it to do that? you dont need to rep grind in the other zones so why Suramar)